-LRB- CNN -RRB- -- Three crew members aboard a U.S. Navy helicopter that crashed in the Red Sea on Sunday were found alive and in stable condition , the Navy said . Two others remained missing .

The MH-60S Knighthawk was operating with the guided-missile destroyer USS William P. Lawrence when it went down in the central Red Sea , which lies between Africa and the Arabian Peninsula .

Search efforts are under way for the two remaining crew members .

The cause of the crash is under investigation ; however , the Navy said it `` was not due to any sort of hostile activity . ''

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Three crew members were found in stable condition

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The crash `` was not due to any sort of hostile activity , '' Navy says